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Subject: Re: Linux 4.9.93
To: Greg KH <gregkh@linuxfoundation.org>,
 Jean-Baptiste Theou <jb@essential.com>,
 Sami Tolvanen <samitolvanen@google.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>,
 Mark Rutland <mark.rutland@arm.com>,
 Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
 Will Deacon <will.deacon@arm.com>, Dan Rue <dan.rue@linaro.org>,
 Mark Brown <mark.brown@linaro.org>, Marc Zyngier <marc.zyngier@arm.com>
References: <20180409180534.1768583293d0abe207168c5a@essential.com>
 <20180409093028.GA3398@kroah.com>
 <CAKv+Gu9Ny=EatuqrVOEFbOt+h0rH5uqxxDyHFT-PLH72ZzvZiw@mail.gmail.com>
 <20180409185751.247a0ac7@jbtheou> <20180409114146.GA20636@kroah.com>
From: Greg Hackmann <ghackmann@google.com>
Message-ID: <fbd6de8b-d2ab-9fcd-75b6-7151f24309e9@google.com>
Date: Mon, 9 Apr 2018 10:02:17 -0700
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On 04/09/2018 04:41 AM, Greg KH wrote:
> On Mon, Apr 09, 2018 at 06:57:51PM +0900, Jean-Baptiste Theou wrote:
>> On Mon, 9 Apr 2018 11:49:37 +0200
>> Ard Biesheuvel <ard.biesheuvel@linaro.org> wrote:
>>
>>> On 9 April 2018 at 11:30, Greg KH <gregkh@linuxfoundation.org> wrote:
>>>> On Mon, Apr 09, 2018 at 06:05:34PM +0900, Jean-Baptiste Theou wrote:  
>>>>> Hi,
>>>>>
>>>>> After this patchset, a kernel built with CFI fails. Disabling
>>>>> UNMAP_KERNEL_AT_EL0 fix the issue obviously.  
>>>
>>> How does one 'build a kernel with CFI' for arm64?
>>
>> From Google work on Android-4.9
>>
>> https://android.googlesource.com/kernel/common/+/00a195e7c0752ff5d65c9caadfbcc226270ca232
>>
>> I am not sure what is the plan on their side to upstream (Greg?), but definitely
>> useful to isolate actual issues.
> 
> Ah, yeah, if you are taking anything from the Android tree, all bets are
> off :)
> 
> Greg Hackmann can probably answer the questions about CFI and these
> patches, as he's working on merging this stable release into the
> android-4.9 branch this week.  I'll let him deal with this...
> 
> thanks,
> 
> greg k-h
> 

I've added Sami Tolvanen, who's handling CFI in the kernel.

Sami, what are the plans for upstreaming this work?